Mitsubishi Electric PRH-P8MYA Operating manual

TECHNICAL & SERVICE MANUAL
AIR-COOLED ROOFTOP
PACKAGED AIR CONDITIONERS
For use with the R407C
2004
HEAT PUMP PRH-P8MYA
PRH-P10MYA
PRH-P16MYA
PRH-P20MYA
Models
<Unit>

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Contents
Page
1PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT
[1] Necessary Apparatus and Materials and Notes on Their Handling
[2] Brazing
[3] Airtightness Test
[4] Vacuuming
[5] Charging of Refrigerant
2TYPICAL INSTALLATION EXAMPLE
3MODEL-DESIGNATION BREAKDOWN
4PART NAMES AND FUNCTIONS
5SPECIFICATIONS
6ELECTRICAL DATA
7EXTERNAL DIMENSIONS
8REMOTE CONTROLLER
9ELECTRICALWIRING DIAGRAM
[1] Unit
[2] Skeleton ofTransmission Line Connection
0Technical Data to Meet LVD
[1] Standard Operation Data
[2] Cooling Capacity Curves
[3] Heating Capacity Curves
[4] Reduction Ratio by Frosting
[5] Capacity/Input Ratio against Changes in Room Airflow Rate
[6] Bypass Factor Curves
[7] Cooling Sensible Heating CapacityTable
[8] Fan Performance
[9] Center of Gravity
[10] NC Curve
ASERVICE DATA
[1] Appearance of Equipment
[2] Refrigerant Circuit
[3] Refrigerant Charge
[4] Operation Range
[5] Safety & Control Devices
1
2
3
4
4
5
6
6
7
9
11
12
14
15
15
16
17
17
19
19
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30
32
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34
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38
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39

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Page
BCONTROL
[1] Composition of Control
[2] Control specifications
[3] Function of switches and connectors (outdoor-side)
[4] Function of switch on indoor-side controller board
[5] Simple parts check method
[6] Reference Data
[7] Troubleshooting of each part
[8] Emergency operation
[9] Self-diagnosis and troubleshooting
CTest run
[1] Before test run
[2] Test run procedures
[3] Self-diagnosis
[4] Remote controller diagnosis
DINSTALLATION
[1] Space required around units
[2] Installation of the unit
[3] Duct construction
[4] Lifting method
[5] Drain piping
[6] Modification method of fan direction (From side flow to top flow)
[7] The putting condition of the belt
40
40
41
45
52
53
54
55
58
60
70
70
70
73
75
76
76
78
79
80
81
82
83

1PRECAUTIONS FOR DEVICESTHAT USE R407C REFRIGERANT
Caution
Use ester oil, ether oil or alkylbenzene (small
amount) as the refrigerator oil to coat flares and
flange connections.
•The refrigerator oil will degrade if it is mixed with a
large amount of mineral oil.
Use liquid refrigerant to seal the system.
•If gas refrigerant is used to seal the system, the com-
position of the refrigerant in the cylinder will change
and performance may drop.
Do not use a refrigerant other than R407C.
•If another refrigerant (R22, etc.) is used, the chlorine
in the refrigerant may cause the refrigerator oil to de-
teriorate.
Be especially careful when managing the tools.
• If dust, dirt, or water gets in the refrigerant cycle, the
refrigerant may deteriorate.
If the refrigerant leaks, recover the refrigerant in the
refrigerant cycle, then recharge the cycle with the
specified amount of the liquid refrigerant indicated
on the air conditioner.
•Since R407C is a nonazeotropic refrigerant, if addi-
tionally charged when the refrigerant leaked, the com-
position of the refrigerant in the refrigerant cycle will
change and result in a drop in performance or abnor-
mal stopping.
Use a vacuum pump with a reverse flow check valve.
•The vacuum pump oil may flow back into the refriger-
ant cycle and cause the refrigerator oil to deteriorate.
Do not use the following tools that have been used
with conventional refrigerants.
(Gauge manifold, charge hose, gas leak detector, re-
verse flow check valve, refrigerant charge base,
vacuum gauge, refrigerant recovery equipment)
• If the conventional refrigerant and refrigerator oil are
mixed in the R407C, the refrigerant may deterio-
rated.
• If water is mixed in the R407C, the refrigerator oil
may deteriorate.
• Since R407C does not contain any chlorine, gas
leak detectors for conventional refrigerants will not
react to it.
Do not use a charging cylinder.
•Using a charging cylinder may cause the refrigerant
to deteriorate.
- 1 -

[1] Necessary Apparatus and Materials and Notes on Their Handling
The following tools should be marked as dedicated tools for R407C.
<<Comparison of apparatus and materials used for R407C and for R22>>
Apparatus Used Use R22 R407C
Gauge manifold Evacuating, refrigerant filling Current product
Charging hose Operation check Current product
Charging cylinder Refrigerant charging Current product Do not use
Gas leakage detector Gas leakage check Current product Shared with R134a
Refrigerant collector Refrigerant collection R22 For R407C use only
Refrigerant cylinder Refrigerant filling R22 Identification of dedi-
cated use for R407C:
Record refrigerant name
and put brown belt on
upper part of cylinder.
Vacuum pump Vacuum drying Current product Can be used by attach-
ing an adapter with a
check valve.
Vacuum pump with a check valve Current product
Flare tool Flaring of pipes Current product
Bender Bending of pipes Current product
Application oil Applied to flared parts Current product Ester oil or Ether oil or
Alkybenzene (Small
amount)
Torque wrench Tightening of flare nuts Current product
Pipe cutter Cutting of pipes Current product
Welder and nitrogen cylinder Welding of pipes Current product
Refrigerant charging meter Refrigerant charging Current product
Vacuum gauge Checking the vacuum degree Current product
Symbols: To be used for R407C only. Can also be used for conventional refrigerants.
Tools for R407C must be handled with more care than those for conventional refrigerants. They must not come into contact
with any water or dirt.
- 2 -

[2] Brazing
No changes from the conventional method, but special care is required so that foreign matter (ie. oxide scale, water, dirt,
etc.) does not enter the refrigerant circuit.
Example: Inner state of brazed section
When non-oxide brazing was not used When non-oxide brazing was used
Items to be strictly observed:
1. Do not conduct refrigerant piping work outdoors on a rainy day.
2. Apply non-oxide brazing.
3. Use a brazing material (BCuP-3) which requires no flux when brazing between copper pipes or between a copper
pipe and copper coupling.
4. If installed refrigerant pipes are not immediately connected to the equipment, then braze and seal both ends of them.
Reasons:
1. The new refrigerant oil is 10 times more hygroscopic than the conventional oil. The probability of a machine failure if
water infiltrates is higher than with conventional refrigerant oil.
2. A flux generally contains chlorine.A residual flux in the refrigerant circuit may generate sludge.
Note:
•Commercially available antioxidants may have adverse effects on the equipment due to its residue, etc. When
applying non-oxide brazing, use nitrogen.
- 3 -

[3] Airtightness Test
No changes from the conventional method. Note that a refrigerant leakage detector for R22 cannot detect R407C leakage.
Halide torch R22 leakage detector
Items to be strictly observed:
1. Pressurize the equipment with nitrogen up to the design pressure and then judge the equipment’s airtightness, taking
temperature variations into account.
2. When investigating leakage locations using a refrigerant, be sure to use R407C.
3. Ensure that R407C is in a liquid state when charging.
Reasons:
1. Use of oxygen as the pressurized gas may cause an explosion.
2. Charging with R407C gas will lead the composition of the remaining refrigerant in the cylinder to change and this
refrigerant can then not be used.
Note:
•Aleakage detector for R407C is sold commercially and it should be purchased.
[4] Vacuuming
1. Vacuum pump with check valve
A vacuum pump with a check valve is required to prevent the vacuum pump oil from flowing back into the refrigerant
circuit when the vacuum pump power is turned off (power failure).
It is also possible to attach a check valve to the actual vacuum pump afterwards.
2. Standard degree of vacuum for the vacuum pump
Use a pump which reaches 0.5 Torr (500 MICRON) or below after 5 minutes of operation.
In addition, be sure to use a vacuum pump that has been properly maintained and oiled using the specified oil. If the
vacuum pump is not properly maintained, the degree of vacuum may be too low.
3. Required accuracy of the vacuum gauge
Use a vacuum gauge that can measure up to 5 Torr. Do not use a general gauge manifold since it cannot measure a
vacuum of 5 Torr.
4. Evacuating time
•Evacuate the equipment for 1 hour after –755 mmHg (5 Torr) has been reached.
• After envacuating, leave the equipment for 1 hour and make sure the that vacuum is not lost.
5. Operating procedure when the vacuum pump is stopped
In order to prevent a backflow of the vacuum pump oil, open the relief valve on the vacuum pump side or loosen the
charge hose to drawn in air before stopping operation.
The same operating procedure should be used when using a vacuum pump with a check valve.
NO NO
- 4 -

[5] Charging of Refrigerant
R407C must be in a liquid state when charging, because it is a non-azeotropic refrigerant.
For a cylinder with a syphon attached For a cylinder without a syphon attached
Cylinder color identification R407C-Gray Charged with liquid refrigerant
R410A-Pink
Reasons:
1. R407C is a mixture of 3 refrigerants, each with a different evaporation temperature. Therefore, if the equipment is
charged with R407C gas, then the refrigerant whose evaporation temperature is closest to the outside temperature is
charged first while the rest of refrigerants remain in the cylinder.
Note:
•In the case of a cylinder with a syphon, liquid R407C is charged without turning the cylinder up side down. Check the
type of cylinder before charging.
Cylin-
der
Cylin-
der
Valve Valve
Liquid
Liquid
- 5 -

2TYPICAL INSTALLATION EXAMPLE
3MODEL-DESIGNATION BREAKDOWN
Series symbol
Self-contained type
(rooftop type)
Refrigerant
P=R407C
Heat pump type Series symbol
Y=3-phase
380V,400V,415V,50Hz,3N~
Design sequence
Compressor horse power
P8=8HP
P10=10HP
P16=16HP
P20=20HP
Design sequence
Service reference
PRH
P R H P 1 0 M Y A E U
- 6 -

PAR-20MAA
ON/OFF
CENTRALLY CONTROLLED
ERROR CODE
CLOCK
ON OFF
ßC
CHECK
CHECK MODE
FILTER
TEST RUN
FUNCTION
ßC
1Hr.
NOT AVAILABLE
STAND BY
DEFROST
FILTER
CHECK TEST
TEMP.
TIMER SET
1
2
3
3
0
1
2
Unit
• Return air : Sucks the ambient air in.
• Supply air : Blows the air back out into
Supply air
Return air
the room.
Remote controller (PAR-20MAA)
• Once the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.
[Operation buttons]
[Room temperature adjustment] Button
[Timer/continuous] Button
[Selecting operation] Button
[Time selection] Button
[Time-setting] Button
[Louver] Button (This button does not operate in this model)
[Fan speed adjustment] Button
[Up/down airflow direction] Button (This button does not operate in this model)
[Ventilation] Button
[Checking/built-in] Button
[Test run] Button
[Filter] Button (This button does not operate in this model)
[ON/OFF] Button
Position of built-in room temperature
•Never expose the remote controller to direct sunlight. Doing so can result in the erroneous measurement of room tem-
perature.
•Never place any obstacle around the lower right-hand section of the remote controller. Doing so can result in the errone-
ous measurement of room temperature.
456879
4PART NAMES AND FUNCTIONS
1
2
3
4
5
6
7
8
9
0
1
2
3
- 7 -

ON/OFF
CENTRALLY CONTROLLED
ERROR CODE
CLOCK
ON OFF
ßC
CHECK
CHECK MODE
FILTER
TEST RUN
FUNCTION
ßC
1Hr.
NOT AVAILABLE
STAND BY
DEFROST
TEMP.
D U T SQC
GH JKLI
B A
R
P
O
N
M
E
F
[Display]
Caution:
• Only the Power display lights when the unit is stopped and power supplied to the unit.
•When power is turned ON for the first time the (CENTRALCTRL) display appears to go off momentarily but this is not
a malfunction.
•When the central control remote control unit, which is sold separately, is used the ON-OFF button, operation switch
button and TEMP. adjustment button do not operate.
•“NOT AVAILABLE” is displayed when the Airflow direction button or Louver button are pressed. This indicates that
this room unit is not equipped with the fan direction adjustment function and the louver function.
•When power is turned ON for the first time, it is normal that “H0” is displayed on the room temperature indication (For
max. 2 minutes). Please wait until this “H0” indication disappear then start the operation.
ACurrent time/Timer
CCentralized control
DAbnormality control
EOperation mode: COOL, AUTO,
FAN, HEAT
FPreparing for Heating mode
GDefrost mode
HSet temperature
IPower ON
JLouver
KNot available function
LVentilation
MFunction setting mode
NTest run mode
OError check mode
PFilter sign
QSet effective for 1 hr.
RSensor position
SRoom temperature
TAirflow
UFan speed
- 8 -

5SPECIFICATIONS
Model name PRH-P8MYA PRH-P10MYA
Mode
Capacity Cooling Heating Cooling Heating
20.9
kW
kcal/h
Btu/h
kW
A
CMM
Pa
kW
CMM
kW
kW
kW
mm
dB(A)
kg
23.7 26.0 30.5
18,000 19,000 22,400 26,200
71,430 75,400 88,890 104,000
R407C
3N~ 380/400/415V 50Hz
Convertible(Side flow<factory setting> or top flow)
Sirrocco fan x 2
8.12 8.02 10.22 9.82
14.7 14.5 18.8 18.2
19
° C to 30 ° C17 ° C to 28 ° C19 ° C to 30 ° C17 ° C to 28 ° C
70
100
59
407
5.5
Three-phase induction motor
1.1
90
100
60
412
7.5
1.5
Cross fin
Propeller fan x 1
185
Three-phase induction motor
0.38
Cross fin
Hermetic
FVC68D(ether oil)
0.05 (240V)
Polyester powder (MUNSELL 5Y8/1)
1,715 x 2,000 x 926
Field supplied
R1
Refrigerant
Power source
Electrical
characteristics Power consumption
Operating current
Type x Quantity
Air flow rate
External static pressure
Motor type
Motor output
Type x Quantity
Air flow rate
Motor type
Motor output
Type
Motor output
Oil type
Crankcase heater
H x W x D
Remote controller temperature setting range
Indoor-side air flow direction
Indoor-side fan
Indoor-side heat exchanger type
Outdoor-side fan
Outdoor-side heat exchanger type
Compressor
External finish
External dimension
Air filter
Drain pipe Thread
Noise level
Net weight
Protection devices High pressure switch , Low pressure switch , fuse
Over current relay(compressor , indoor-side fan motor)
inner thermal switch in outdoor-side fan motor
Note 1. Cooling and Hetaing capacity indicates the maximum value at operation under the following condition.
Cooling Indoor : 27
° CDB/19 ° CWB Outdoor : 35 ° CDB
Heating Indoor : 20
° CDB Outdoor : 7 ° CDB/6 ° CWB
2. The operating noise measuring point is 1m from the bottom of unit (1m from the front of the unit) in an
anechoic room. (Noise level is A-scale value)
3. Refrigerant charge volumes are factory charged.
4. The range of working voltage is with in ±10% voltage of power supply.
5. Specification subject to change without notice.
Specifications of air-source heat pump type packaged air conditioner
(Rooftop unit)
- 9 -

Model name PRH-P16MYA PRH-P20MYA
Mode
Capacity Cooling Heating Cooling Heating
41.8
kW
kcal/h
Btu/h
kW
A
CMM
Pa
kW
CMM
kW
kW
kW
mm
dB(A)
kg
47.4 52.0 61.0
36,000 40,800 44,800 52,400
142,860 150,800 177,780 208,000
R407C
3N~ 380/400/415V 50Hz
Convertible(Side flow<factory setting> or top flow)
Sirrocco fan x 2
16.60 15.94 21.44 19.24
29.6 29.2 36.6 35.4
19
° C to 30 ° C17 ° C to 28 ° C19 ° C to 30 ° C17 ° C to 28 ° C
140
200
62
857
5.5 x 2
Three-phase induction motor
2.2
180
200
63
872
7.5 x 2
3.7
Cross fin
Propeller fan x 2
185 x 2
Three-phase induction motor
0.38 x 2
Cross fin
Hermetic
FVC68D(ether oil)
0.05 (240V) x 2
Polyester powder (MUNSELL 5Y8/1)
1,735 x 2,000 x 2,130
Field supplied
R1
Refrigerant
Power source
Electrical
characteristics Power consumption
Operating current
Type x Quantity
Air flow rate
External static pressure
Motor type
Motor output
Type x Quantity
Air flow rate
Motor type
Motor output
Type
Motor output
Oil type
Crankcase heater
H x W x D
Remote controller temperature setting range
Indoor-side air flow direction
Indoor-side fan
Indoor-side heat exchanger type
Outdoor-side fan
Outdoor-side heat exchanger type
Compressor
External finish
External dimension
Air filter
Drain pipe Thread
Noise level
Net weight
Protection devices High pressure switch , Low pressure switch , fuse
Over current relay(compressor , indoor-side fan motor)
inner thermal switch in outdoor-side fan motor
Note 1. Cooling and Hetaing capacity indicates the maximum value at operation under the following condition.
Cooling Indoor : 27
° CDB/19 ° CWB Outdoor : 35 ° CDB
Heating Indoor : 20
° CDB Outdoor : 7 ° CDB/6 ° CWB
2. The operating noise measuring point is 1m from the bottom of unit (1m from the front of the unit) in an
anechoic room. (Noise level is A-scale value)
3. Refrigerant charge volumes are factory charged.
4. The range of working voltage is with in ±10% voltage of power supply.
5. Specification subject to change without notice.
Specifications of air-source heat pump type packaged air conditioner
(Rooftop unit)
- 10 -

6ELECTRICAL DATA
VOLT
TOTAL INPUT
TOTAL RATED CURRENT
POWER FACTOR
START CURRENT
COMPRESSOR INPUT
RATED CURRENT
O/D FAN INPUT
RATED CURRENT
I/D FAN External static pressure
INPUT
RATED CURRENT
TOTAL INPUT
TOTAL RATED CURRENT
POWER FACTOR
START CURRENT
COMPRESSOR INPUT
RATED CURRENT
O/D FAN INPUT
RATED CURRENT
I/D FAN External static pressure
INPUT
RATED CURRENT
TOTAL INPUT
TOTAL RATED CURRENT
POWER FACTOR
START CURRENT
COMPRESSOR INPUT
RATED CURRENT
O/D FAN INPUT
RATED CURRENT
I/D FAN External static pressure
INPUT
RATED CURRENT
415V
400V
380V
kW
A
%
A
kW
A
kW
A
Pa
kW
A
kW
A
%
A
kW
A
kW
A
Pa
kW
A
kW
A
%
A
kW
A
kW
A
Pa
kW
A
8.12
14.7
76
111
6.96
11.9
0.31
1.1
100
0.85
1.7
8.12
14.7
79
111
6.96
11.9
0.31
1.1
100
0.85
1.7
8.12
14.7
83
111
6.96
11.9
0.31
1.1
100
0.85
1.7
8.02
14.5
76
111
6.86
11.7
0.31
1.1
100
0.85
1.7
8.02
14.5
79
111
6.86
11.7
0.31
1.1
100
0.85
1.7
8.02
14.5
84
111
6.86
11.7
0.31
1.1
100
0.85
1.7
10.22
18.8
75
134
8.71
14.9
0.31
1.1
100
1.2
2.8
10.22
18.8
78
134
8.71
14.9
0.31
1.1
100
1.2
2.8
10.22
18.8
82
134
8.71
14.9
0.31
1.1
100
1.2
2.8
9.82
18.2
75
134
8.31
14.3
0.31
1.1
100
1.2
2.8
9.82
18.2
77
134
8.31
14.3
0.31
1.1
100
1.2
2.8
9.82
18.2
81
134
8.31
14.3
0.31
1.1
100
1.2
2.8
ITEM PRH-P8MYA PRH-P10MYA
Cooling
VOLT
TOTAL INPUT
TOTAL RATED CURRENT
POWER FACTOR
START CURRENT
COMPRESSOR INPUT
RATED CURRENT
O/D FAN INPUT
RATED CURRENT
I/D FAN External static pressure
INPUT
RATED CURRENT
TOTAL INPUT
TOTAL RATED CURRENT
POWER FACTOR
START CURRENT
COMPRESSOR INPUT
RATED CURRENT
O/D FAN INPUT
RATED CURRENT
I/D FAN External static pressure
INPUT
RATED CURRENT
TOTAL INPUT
TOTAL RATED CURRENT
POWER FACTOR
START CURRENT
COMPRESSOR INPUT
RATED CURRENT
O/D FAN INPUT
RATED CURRENT
I/D FAN External static pressure
INPUT
RATED CURRENT
415V
400V
380V
kW
A
%
A
kW
A
kW
A
Pa
kW
A
kW
A
%
A
kW
A
kW
A
Pa
kW
A
kW
A
%
A
kW
A
kW
A
Pa
kW
A
16.60
29.6
78
126
14.38
23.8
0.62
2.2
200
1.6
3.6
16.60
29.6
80
126
14.38
23.8
0.62
2.2
200
1.6
3.6
16.60
29.6
85
126
14.38
23.8
0.62
2.2
200
1.6
3.6
15.94
29.2
75
126
13.72
23.4
0.62
2.2
200
1.6
3.6
15.94
29.2
78
126
13.72
23.4
0.62
2.2
200
1.6
3.6
15.94
29.2
82
126
13.72
23.4
0.62
2.2
200
1.6
3.6
21.44
36.6
81
152
18.82
29.8
0.62
2.2
200
2.0
4.6
21.44
36.6
84
152
18.82
29.8
0.62
2.2
200
2.0
4.6
21.44
36.6
89
152
18.82
29.8
0.62
2.2
200
2.0
4.6
19.24
35.4
75
151
16.62
28.6
0.62
2.2
200
2.0
4.6
19.24
35.4
78
151
16.62
28.6
0.62
2.2
200
2.0
4.6
19.24
35.4
82
151
16.62
28.6
0.62
2.2
200
2.0
4.6
ITEM PRH-P16MYA PRH-P20MYA
Cooling Heating HeatingCooling
Heating HeatingCooling
- 11 -

• Models PRH-P8MYA/P10MYA
7EXTERNAL DIMENSIONS
Drain R1
Fresh air intake (Both side)
28- ø 3 Holes
18- ø 3 Holes Supply air
duct flange
Return air duct flange
Note 3
Y Y
Y-Y
X-X
Left side view
ø 25.4 Knockout hole
<Bottom side hole for the controller wiring>
Note 1
ø 38.1 Knockout hole
<Bottom side hole for the power supply wiring> Top view
Drain R1 6-14X20 holes
<For mounting anchor bolt M8> [Field supply]
6- ø 3.9 holes
(Both side)
Return air Supply air
Service panel
Knockout hole
ø 27 hole
<Front side hole for the controller wiring> (Accessory plate)
Service panel
Front view Note 2
ø 40 hole
<Front side hole for the power supply wiring> (Accessory plate)
XX
Note 1. It is possible to change to ø 27 or
ø 34 by selecting the conduit mounting plate.
2. The hole size can be selected to
ø 27 or ø 34 or ø 40 by selecting the conduit mounting plate.
3. These dimension of supply air and
return air duct flange are the same.
<Accessory> • Conduit mounting plate
(Painted the same color as the unit body) ø 27..................................................1pc.
ø 34..................................................1pc.
ø 40 and ø 27................................. 1pc.
• Tapping screw 4X12........................4pcs.
Air inlet
Air outlet
Air inlet
Right side view
ø 38.1 Knockout hole
<Right side hole for the power supply wiring>
ø 25.4 Knockout hole
<Right side hole for the controller wiring>
270 1569 250 1579
69
18518595 350105
149
495
585
86
144
1932
2000
7X130Pitch=910
84
5X135Pitch=675
56
68
50
121
155 611
23
4646 36.5
135
36.5 748
10 800 800
1515 840 880
910
961
1399
10
10
43 151001001543
130
23038699560
1715
82960 165 794 65
6084
- 12 -

4X150Pitch=600
10
65 65
(730)
(434)
10
150
44 13X150Pitch=1950 44
10
67 150 150 67
10
(2038)
(1312)
56 8X150Pitch=1200 56
150
50 50
5
56
6
165 794
80
169
104
839
89
155155105
290115
1030
293 525
434202
46 2038 46
1312
73080
65
80104
1661
1671
200 180
1549
2170
2200
1515
68 1932
800 800 144
2000
2130
585
495
585
111
155 611
1735
150
23
• Models PRH-P16MYA/P20MYA
Supply air cover for top flow
Air inlet Air
inlet
Air outlet
Y
Service panel
air
Return
air
Air inlet
Fresh air intake (Both side)
Drain R1
Supply air
Return air duct flange Note 2
duct flange Note 2
Y
Y-Y
X-X
Left side view
ø25.4 Knockout hole
<Bottom side hole for the controller wiring>
Note 1
ø50.8 Knockout hole
<Bottom side hole for the power supply wiring>
Top view
Drain R1 6-14X20 holes
<For mounting
6- ø3.9 holes
(Both side)
anchor bolt M10> [Field supply]
ø27 hole
<Front side hole for the controller wiring> (Accessory plate)
Supply
Knockout hole
Service panel
Front view
Note 1 ø52 hole
<Front side hole for the power supply wiring> (Accessory plate)
XX
Note 1.It is possible to change to ø40 by
selecting the conduit mounting plate. 2.Dimension of supply air and return air duct flange are shown below.
<Accessory> • Conduit mounting plate
(Painted the same color as the unit body) ø40 ············ 1pc.
············ 1pc.
············ 4pcs.
ø52 and ø27
• Tapping screw 4X12
Air outlet
Right side view
ø50.8 Knockout hole
<Right side hole for the power supply wiring>
ø25.4 Knockout hole
<Right side hole for the controller wiring>
Return air duct flange
38- ø3 Holes
24- ø3 Holes
Supply air duct flange
- 13 -

120
130 19 46
83.5
(Front view) (Side view) (Rear view)
• Model PAR-20MAA
8REMOTE CONTROLLER
- 14 -

[1] Unit
9
• Models PRH-P8MYA/P10MYA
ELECTRICALWIRING DIAGRAM
Symbol Name Symbol Name Symbol Name
IN
DOOR
-SIDE
OUT
DOOR
-SIDE
SURGE KILLER
COND/EVA TEMP
LIQUID PIPE TEMP
ROOM TEMP
COND/EVA TEMP
DISCHARGE TEMP
THERMISTOR
FERRITE CORE FB1,FB2
CR
TH6
TH5
TH4
TH3
TH2
TH1 LIQUID PIPE TEMP
PRESSURE SWITCH (FOR CONTROL)
PRESSURE SWITCH (HIGH PRESSURE)
OVER CURRENT RELAY (INDOOR-SIDE FAN MOTOR)
FAN MOTOR (INDOOR-SIDE)
TERMINAL BLOCK
ELECTRONIC EXPANSION VALVE
CRANK CASE HEATER (COMPRESSOR)
SOLENOID VALVE
4-WAY VALVE
FAN MOTOR (OUTDOOR-SIDE)
PRESSURE SWITCH (LOW PRESSURE)
MAGNETIC CONTACTOR (COMPRESSOR)
MAGNETIC CONTACTOR (INDOOR-SIDE FAN MOTOR) 52F
51F
MF1
TB1,5
LEV
CH
SV1
21S4
OVER CURRENT RELAY (COMPRESSOR)
COMPRESSOR MOTOR
TRANSFORMERTR
MF2
MC
63H2
63H1
63L
52C
51C FUSE (15A 250VAC CLASS T)F1,F2
Symbol Name
TERMINAL BLOCKTB6
REMOTE CONTROLLER
LED (FOR SERVICE)
AUXILIARY RELAY
SWITCHSW1-5
LED1
X01-X05
FUSE (6.3A 250VAC CLASS F)F01-F04
FUSE (6.3A 250VAC CLASS F)F10-F30
INDOOR-SIDE CONTROLLER BOARD
X4-6
SW1
SW2
SWE
LED1
LED2
LED3
LED (TRANSMISSION<INDOOR-SIDE·OUTDOOR-SIDE>)
LED (POWER SUPPLY<REMOTE CONTROLLER>)
LED (POWER SUPPLY)
SWITCH (EMERGENCY OPERATION)
SWITCH (CAPACITY CORD)
SWITCH (MODEL SELECTION)
AUXILIARY RELAY
INDOOR-SIDE POWER BOARD
OUTDOOR-SIDE CONTROLLER BOARD
N.F BOARD
F1
ZNR FUSE (4A 250VAC CLASS T) VARISTOR
BLACK
(WITH INDOOR
POWER
BOARD)
BK
3
51F
PE
PE
CN90
CN2L
CN22 CN32
CN41
CN29
CN21
CN2D
DC14V 51
CN03 157
FAN 3
5321
X4 X5 X6
LCD
F1
ZNR
CN01
CN02
52F
TH6
TH5
TH4
TB5
FB1
CN2S
DC14V
SWE
SW1
REMOTE CONTROLLER
LED1
LED2
LED3
DC
14V
CN
OFF
ON
1
2
3
4
(*3)SW2
CN20
4
OFF
ON
OFF
ON
1234
INDOOR-SIDE
POWER BOARD
INDOOR-SIDE
CONTROLLER BOARD
FB2
REMOTE CONTROLLER
BOARD
1
2
RETURN AIR
DUCT
SUPPLY AIR
DUCT
CR
3
2
32 1
1
1
1
2
3
4
2
1
1
2
3
1
2
1
2
2
9
5
1
2
X6X5
1
X4
2
6
7
8
1
TB6
2
F1
F2
5
3
531
BLACK WHITE RED
CNIN
LED1
SW3
12
OFF
ON 3456
(*2)SW5
65
1
12
OFF
ON
OUTDOOR-SIDE
CONTROLLER BOARD
12
OFF
ON
SW2
34
TR
SW1SW4
OFF
C14
63H2
1
2
1
3
CN51
CN81
CN27
CN24
CN3D
DC POWER
SUPPLY
CN3N
CN3S
CN34CN28
3131
TRANSMISSION
CIRCIT
31
CNS3
CH 63L63H1
SV1
21S4
TH3TH2TH1
LEV
X05
X02
X03
X01
12
CN4
12
CN3
12
CN2CN40CNMNTCNVMNT
CNFG
F01
F04
F02
F03
13
CN20
CNFC1
CN52
CN53
CN25
CN26 X04
CN21
CN22
CN23
52C
52C
51C
7
1
1
6
1
5
1
3
1
3
5
1
3
1
3
1
3
1
531
CNOUT1
PE
31
1
MF1
51F
52F
WHITE
1
BLUE
3
BLACK
RED
F30
WHITE
F20
F10
7
5
3
31
BLACK
CNOUT2
1
3
MC
L1
51C
52C
MF2
RED
TB1
ON 432
L2
5
L3 NPE
PE
(*1)
6
POWER SUPPLY
3N~PE
380/400/415V
50HZ
31
CNPOW
CNFC2
CNFAN
C11
CIRCUIT BREAKER
(FIELD SUPPLY)
PRH-P8MYA : 63A
PRH-P10MYA: 63A
N
L1
N.F.BOARD
L3
L2
PE
GREEN/YELLOW
F.C.
BOARD
C12
CONTROL BOX
Note:1.The dotted lines show field wiring.
2. Color of earth wire is yellow and green twisting.
3. Specification subject to change without notice.
4.This motor(*1) includes auto reset type internal thermostat.
5. SW5(*2)[outdoor-side controller board] is shown
In case of PRH-P8MYA setting is shown as below.
PRH-P10MYA setting.
6. SW2(*3)[indoor-side controller board] is shown
In case of PRH-P8MYA setting is shown as below.
PRH-P10MYA setting.
7. Emergency operation
If a trouble occurs with either the remote controller or the unit
microcomputer and no other trouble exists, emergency operation for
cooling or heating can be performed by changing the setting of
switch (SWE) on the indoor-side controller board.
8. mark is connector.
Caution,
1. To protect compressor and fan
motor (indoor-side) from
abnormal current, over current
relays is installed. Therefore,
do not change factory over
current relays is installed.
Therefore, do not change
factory set value of over current
relays.
ON
OFF
SW5
(*2)
ON
OFF
SW2
4321
(*3)
[intdoor-side controller board]
[outdoor-side controller board]
4321
- 15 -

• Models PRH-P16MYA/P20MYA
[2] Skeleton ofTransmission Line Connection
(1) System Unit
Remote
controller
Transmission line
Symbol Name Symbol Name Symbol Name
IN
DOOR
OUT
DOOR
SURGE KILLER
COND/EVA TEMP
LIQUID PIPE TEMP
ROOM TEMP
COND/EVA TEMP
DISCHARGE TEMP
THERMISTOR
FERRITE CORE FB11,12,21,22
CR
TH6-1,TH6-2
TH5-1,TH5-2
TH4-1,TH4-2
TH3-1,TH3-2
TH2-1,TH2-2
TH1-1,TH1-2
LIQUID PIPE TEMP
PRESSURE SWITCH (FOR CONTROL)
PRESSURE SWITCH (HIGH PRESSURE)
OVER CURRENT RELAY (INDOOR FAN MOTOR)
FAN MOTOR (INDOOR)
TERMINAL BLOCK
ELECTRONIC EXPANSION VALVE
CRANK CASE HEATER (COMPRESSOR)
SOLENOID VALVE
4-WAY VALVE
FAN MOTOR (OUTDOOR)
PRESSURE SWITCH (LOW PRESSURE)
MAGNETIC CONTACTOR (COMPRESSOR)
51F
MF1
TB1,5,11,21
LEV1,LEV2
CH1,CH2
SV11,SV12
21S41,21S42
MAGNETIC CONTACTOR (INDOOR FAN MOTOR) 52F
OVER CURRENT RELAY (COMPRESSOR)
TR1,TR2
MF21,MF22
MC1,MC2
63H21,63H22
63H11,63H12
63L1,63L2
52C1,52C2
51C1,51C2
COMPRESSOR MOTOR
F11,12,21,22
TRANSFORMER
FUSE (15A 250VAC CLASS T)
Symbol Name
TERMINAL BLOCKTB6
REMOTE CONTROLLER
LED (FOR SERVICE)
AUXILIARY RELAY
SWITCHSW1-5
LED1
X01-X05
FUSE (6.3A 250VAC CLASS F)F01-F04
FUSE (6.3A 250VAC CLASS F)F10-F30
INDOOR CONTROLLER BOARD
X4-6
SW1
SW2
SWE
LED1
LED2
LED3
LED (TRANSMISSION<INDOOR·OUTDOOR>)
LED (POWER SUPPLY<REMOTE CONTROLLER>)
LED (POWER SUPPLY)
SWITCH (EMERGENCY OPERATION)
SWITCH (CAPACITY CORD)
SWITCH (MODEL SELECTION)
AUXILIARY RELAY
INDOOR POWER BOARD
OUTDOOR MAIN BOARD
N.F BOARD
F1
ZNR FUSE (4A 250VAC CLASS T) VARISTOR
Note:1.The dotted lines show field wiring.
2. Color of earth wire is yellow and green twisting.
3. Specification subject to change without notice.
4.This motor(*1) includes auto reset type internal thermostat.
5. SW5(*2)[outdoor main board] shows PRH-P20MYA setting.
Control box no.1
In case of PRH-P16MYA setting is shown as below.
6. SW2(*3)[indoor controller board] shows
In case of PRH-P16MYA setting is shown as below.
PRH-P20MYA setting.
7. Emergency operation
If a trouble occurs with either the remote controller or the unit
microcomputer and no other trouble exists, emergency operation for
cooling or heating can be performed by changing the setting of
switch (SWE) on the indoor controller board.
8. mark is connector.
Caution,
1. To protect compressor and fan
motor (indoor) from abnormal
current, over current relays is
installed. Therefore, do not
change factory set value of
over current relays.
ON
OFF
SW5(*2)
ON
OFF
SW2
4321
(*3)
[intdoor controller board]
[outdoor main board]
4321
Control box no.2
ON
OFF
SW5(*2) [outdoor main board]
4321
CONTROL BOX NO.2CONTROL BOX NO.1
BLACK
WHITE
RED
1
3
C19
X22
1
2
1
2
36
31
GREEN/YELLOW
BLUE
BLACK
WHITE
RED
L1
L2
L3
N
PE
1
2
2
1
X11
63
31
PE
N
L3
L2
L1
6
5
4
3
2
11
2
3
4
5
6
TB1
POWER SUPPLY
3N~PE
380/400/415V
50HZ
L1
L2
L3
63H22
LED1
SW3
(*2)SW5
OUTDOOR MAIN BOARD
OFFON
SW2
TR2
SW1
SW4
OFF
C14
13
CN51
CN3D
DC POWER
SUPPLY CN34
CN28
3
1
TRANSMISSION
CIRCUIT 3
1
CNS3
CH2
63L2
63H12
21S42
TH3-2
LEV2
X05X02
X03 X01
1
2CN4
CNMNT
CNVMNT CNFG
F01
1
3
CN20
CNFC1
CN52
X04
52C2
51C2
1
ON
L3
2
1
2
1
TH2-2
TH1-2
CN3
CN2
CN40
CN3S CN3N CN24 CN27 CN81
12
1
3
F04 F02 F03
357 L2NL1 61
51
CN53CN25
3131531313131
CN26CN21CN22CN23
ON OFF ON OFF
X22
1
2
3
4
5
6
2
1
4
3
2
1
52C2
SV12
MF22
(*1)
C12
C11
3
1
3
1
5
3
1
CNFC2
CNFAN
F.C.
BOARD
16
3
1
55
3
1
CNOUT1
CNOUT2
3
1N.F.BOARD
F20 F30
F10
7513 CNIN
CNPOW
PE
MC2
BLACK
RED
WHITE 51C2 52C2 BLUE
BLACK
RED
WHITE
TB21
GREEN/YELLOW
GREEN/YELLOW
RED
WHITE
BLACK
RED
WHITE
BLACK
WHITE
BLACK
753
5
3
1
3
1
MF21
1
2
3
4
1
2
6
5
4
3
2
1
X11
OFFONOFFON
CN23 CN22 CN21 CN26
1313131351313
CN25 CN53
151 6
L1 N L2
753
F03F02F04
3
1
21
CN81CN27CN24CN3NCN3S
CN40
CN2
CN3
TH1-1
TH2-1 1
2
1
2
N
PE PE
CIRCUIT BREAKER
(FIELD SUPPLY)
PRH-P16MYA: 63A
PRH-P20MYA: 70A
C12
F.C.
BOARD
PE
L3
N.F.BOARD
C11
CNFAN
CNFC2
CNPOW
1
36
(*1) 5
ON
TB11
52C1
51C1
MC1
3
1
CNOUT2
RED
1
3
F10
F20 F30
BLUE
1
52F
51F
MF1
1
PE
CNOUT1
1
51C1
52C1
52C1
X04
CN52
CNFC1
CN20
3
1
F01
CNFG
CNVMNT
CNMNT
CN4
2
1
X01
X03 X02 X05
LEV1
TH3-1
21S41
SV11
63H11
63L1
CH1
CNS3
1
3
TRANSMISSION
CIRCUIT
1
3
CN28
CN34
DC POWER
SUPPLY
CN3D CN51
31
63H21
C14
OFF
SW4
SW1
TR1
SW2
ON OFF
OUTDOOR MAIN BOARD
(*2)SW5
SW3
LED1
CNIN
1
3
5
C28
X2
X1
INDOOR
POWER BOARD
BLACK
(WITH INDOOR
POWER BOARD)
C18
C18
C28
X1
X2
51F 52F
CR
F22 F12
TH4-2 TH5-2 TH6-2
FB22 1234
CN41
12 12 12
CN29CN21CN20
1
2
3
4SW2
(*3)
1
2
3
4
5SW1
SWE
X4
X5
X6
X6
X5
X4
1
3
5
7
FAN
3
1
5
CN03
123
CN32
INDOOR CONTROLLER
BOARD
1
2
CN2D
DC14V
1122
CN22CN2L
789123456
CN90
FB12
2
3
1
CN01
213 BK
CN02
ZNRF1
DC14V
12
CN2S
DC14V
LED1 LED2 LED3
REMOTE CONTROLLER
BOARD
TB6 CN
LCD
LED1LED2LED3
PE
987654123
2121
32
5
3
1
7
5
3
X4
X5
ONOFF
SWE
1
2
3
4
ONOFF
SW2(*3)
1
2
3
4
5
ONOFF ON OFFONOFFONOFF
SW1
12
1212432
F21 F11
X4
X5
X6
2
11
2
1
1
1
2
323
SUPPLY AIR
DUCT
RETURN AIR
DUCT
21
FB21
INDOOR CONTROLLER
BOARD
INDOOR
POWER BOARD
CN20
1
DC14V
REMOTE
CONTROLLER
CN2S
DC14V
FB11
TB5
TH4-1 TH5-1 TH6-1
CN02
CN01
ZNR F1
X6
FAN
1
CN03
CN2D
DC14V
CN21
CN29
CN41
CN32
CN22CN2L
CN90
PE
BK
(WITH INDOOR
POWER BOARD)
BLACK
- 16 -

(2) PRH-P10MYA
(1) PRH-P8MYA
[1] Standard Operation Data
0Technical Data to Meet LVD
380 400 415 380 400 415
50 50 50 50 50 50
27/19 27/19 27/19 20/– 20/– 20/–
35/– 35/– 35/– 7/6 7/6 7/6
7.7 7.7 7.7 7.7 7.7 7.7
14.7 14.7 14.7 14.5 14.5 14.5
11.9 11.9 11.9 11.7 11.7 11.7
1.1 1.1 1.1 1.1 1.1 1.1
1.7 1.7 1.7 1.7 1.7 1.7
2.25 2.25 2.25 1.72 1.72 1.72
0.56 0.56 0.56 0.38 0.38 0.38
77 77 77 66 66 66
10 10 10 -1 -1 -1
48 48 48 0 0 0
33 33 33 28 28 28
Operating condition
Operating condition Cooling Heating
Voltage V
Power source frequency Hz
Indoor air condition (DB/WB) °C
Outdoor air condition (DB/WB) °C
Refrigerant charge kg
Rated current A
Compressor current A
Rated currentO/D FAN A
Rated current A
Discharge pressure MPa
Suction pressure MPa
Discharge refrigerant temperature °C
Suction refrigerant temperature °C
Liquid pipe temperature (at piping sensor) °C
Compressor shell bottom temperature °C
Total
I/D FAN
Refrigerant circuit
Electrical characteristics
380 400 415 380 400 415
50 50 50 50 50 50
27/19 27/19 27/19 20/– 20/– 20/–
35/– 35/– 35/– 7/6 7/6 7/6
8.2 8.2 8.2 8.2 8.2 8.2
18.8 18.8 18.8 18.2 18.2 18.2
14.9 14.9 14.9 14.3 14.3 14.3
1.1 1.1 1.1 1.1 1.1 1.1
2.8 2.8 2.8 2.8 2.8 2.8
2.31 2.31 2.31 1.83 1.83 1.83
0.55 0.55 0.55 0.37 0.37 0.37
78 78 78 70 70 70
999–1–1–1
48 48 48 3 3 3
32 32 32 25 25 25
Operating condition
Operating condition Cooling Heating
Voltage V
Power source frequency Hz
Indoor air condition (DB/WB) °C
Outdoor air condition (DB/WB) °C
Refrigerant charge kg
Rated current A
Compressor current A
Rated current A
Rated current A
Discharge pressure MPa
Suction pressure MPa
Discharge refrigerant temperature °C
Suction refrigerant temperature °C
Liquid pipe temperature (at piping sensor) °C
Compressor shell bottom temperature °C
Total
I/D FAN
O/D FAN
Refrigerant circuit
Electrical characteristics
- 17 -